<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加分类 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
        class="treeTable"
      >
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen"
          ></i>
          <i class="el-icon-error" v-else style="color:red"></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag type="success" size="mini" v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryinfo.pagenum"
        :page-sizes="[1, 3, 5, 10]"
        :page-size="queryinfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
      title="分类表单"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="活动名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类:">
          <!-- options用来指定数据源 -->
          <!-- props级联选择器的配置选项,配置展示，选中，哪个节点实现父子嵌套 -->
          <!-- v-model将选中的值，双向绑定到data中 -->
          <el-cascader
            expandTrigger="hover"
            :options="parentCateList"
            :props="cascaderProps"
            v-model="selectedKeys"
            @change="parentCateChanged"
            clearable
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //查询条件
      queryinfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      //商品列表
      catelist: [],
      //总数据条数
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          //当前定义为模板列
          type: 'template',
          //当前这一列使用模板名称
          template: 'isok'
        },
        {
          label: '排序',
          //当前定义为模板列
          type: 'template',
          //当前这一列使用模板名称
          template: 'order'
        },
        {
          label: '操作',
          //当前定义为模板列
          type: 'template',
          //当前这一列使用模板名称
          template: 'opt'
        }
      ],
      //控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,
      //添加分类的表单数据对象
      addCateForm: {
        //将要添加的分类的名称
        cat_name: '',
        //父级分类的id
        cat_pid: 0,
        //分类的等级，默认要添加的是1级分类
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedKeys: []
    }
  },
  created: function() {
    //获取商品分类列表数据
    this.getCateList()
  },
  methods: {
    getCateList: async function() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryinfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表数据错误')
      }
      //为数据列表赋值
      this.catelist = res.data.result

      //为总数据条数赋值
      this.total = res.data.total
    },
    handleSizeChange: function(newsize) {
      this.queryinfo.pagesize = newsize
      this.getCateList()
    },
    handleCurrentChange: function(newnum) {
      this.queryinfo.pagenum = newnum
      this.getCateList()
    },
    showAddCateDialog: function() {
      //获取分类数据列表
      this.getParentCateList()
      //打开分类列表的对话框
      this.addCateDialogVisible = true
    },
    //获取父级分类的数据列表
    getParentCateList: async function() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取分类列表数据失败')
      }
      this.parentCateList = res.data
      // console.log(this.parentCateList)
    },
    //选择触发发生的这个函数
    parentCateChanged: function() {
      // console.log(this.selectedKeys)
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        //父级分类的id
        this.addCateForm.cat_pid = 0
        //父级分类的等级
        this.addCateForm.cat_level = 0
      }
    },
    addCate: function() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )

        if (res.meta.status !== 201) return this.$message.error('添加分类失败')
        this.$message.success('添加分类成功')
        //更新分类列表
        this.getCateList()
        //关闭对话框
        this.addCateDialogVisible = false
      })
    },
    //监听对话框的关闭事件，重置对话框的表单数据
    addCateDialogClosed: function() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = ''
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    }
  }
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>